/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.activiti.engine.impl.persistence.entity.data.impl;

import static java.util.Collections.emptyList;

import java.util.List;
import java.util.Map;

import org.activiti.engine.history.HistoricProcessInstance;
import org.activiti.engine.impl.HistoricProcessInstanceQueryImpl;
import org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.persistence.entity.HistoricProcessInstanceEntity;
import org.activiti.engine.impl.persistence.entity.HistoricProcessInstanceEntityImpl;
import org.activiti.engine.impl.persistence.entity.data.AbstractDataManager;
import org.activiti.engine.impl.persistence.entity.data.HistoricProcessInstanceDataManager;

/**

 */
public class MybatisHistoricProcessInstanceDataManager extends AbstractDataManager<HistoricProcessInstanceEntity> implements HistoricProcessInstanceDataManager {

  public MybatisHistoricProcessInstanceDataManager(ProcessEngineConfigurationImpl processEngineConfiguration) {
    super(processEngineConfiguration);
  }

  @Override
  public Class<? extends HistoricProcessInstanceEntity> getManagedEntityClass() {
    return HistoricProcessInstanceEntityImpl.class;
  }

  @Override
  public HistoricProcessInstanceEntity create() {
    return new HistoricProcessInstanceEntityImpl();
  }

  @Override
  public HistoricProcessInstanceEntity create(ExecutionEntity processInstanceExecutionEntity) {
    return new HistoricProcessInstanceEntityImpl(processInstanceExecutionEntity);
  }

  @Override
  @SuppressWarnings("unchecked")
  public List<String> findHistoricProcessInstanceIdsByProcessDefinitionId(String processDefinitionId) {
    return getDbSqlSession().selectList("selectHistoricProcessInstanceIdsByProcessDefinitionId", processDefinitionId);
  }

  @Override
  @SuppressWarnings("unchecked")
  public List<HistoricProcessInstanceEntity> findHistoricProcessInstancesBySuperProcessInstanceId(String superProcessInstanceId) {
    return getDbSqlSession().selectList("selectHistoricProcessInstanceIdsBySuperProcessInstanceId", superProcessInstanceId);
  }

  @Override
  public long findHistoricProcessInstanceCountByQueryCriteria(HistoricProcessInstanceQueryImpl historicProcessInstanceQuery) {
    return (Long) getDbSqlSession().selectOne("selectHistoricProcessInstanceCountByQueryCriteria", historicProcessInstanceQuery);
  }

  @Override
  @SuppressWarnings("unchecked")
  public List<HistoricProcessInstance> findHistoricProcessInstancesByQueryCriteria(HistoricProcessInstanceQueryImpl historicProcessInstanceQuery) {
    return getDbSqlSession().selectList("selectHistoricProcessInstancesByQueryCriteria", historicProcessInstanceQuery);
  }

  @Override
  public List<HistoricProcessInstance> findHistoricProcessInstancesAndVariablesByQueryCriteria(HistoricProcessInstanceQueryImpl historicProcessInstanceQuery) {
    // paging doesn't work for combining process instances and variables
    // due to an outer join, so doing it in-memory
    if (historicProcessInstanceQuery.getFirstResult() < 0 || historicProcessInstanceQuery.getMaxResults() <= 0) {
      return emptyList();
    }

    int firstResult = historicProcessInstanceQuery.getFirstResult();
    int maxResults = historicProcessInstanceQuery.getMaxResults();

    // setting max results, limit to 20000 results for performance reasons
    if (historicProcessInstanceQuery.getProcessInstanceVariablesLimit() != null) {
      historicProcessInstanceQuery.setMaxResults(historicProcessInstanceQuery.getProcessInstanceVariablesLimit());
    } else {
      historicProcessInstanceQuery.setMaxResults(getProcessEngineConfiguration().getHistoricProcessInstancesQueryLimit());
    }
    historicProcessInstanceQuery.setFirstResult(0);

    List<HistoricProcessInstance> instanceList = getDbSqlSession().selectListWithRawParameterWithoutFilter("selectHistoricProcessInstancesWithVariablesByQueryCriteria", historicProcessInstanceQuery,
        historicProcessInstanceQuery.getFirstResult(), historicProcessInstanceQuery.getMaxResults());

    if (instanceList != null && !instanceList.isEmpty()) {
      if (firstResult > 0) {
        if (firstResult <= instanceList.size()) {
          int toIndex = firstResult + Math.min(maxResults, instanceList.size() - firstResult);
          return instanceList.subList(firstResult, toIndex);
        } else {
          return emptyList();
        }
      } else {
        int toIndex = Math.min(maxResults, instanceList.size());
        return instanceList.subList(0, toIndex);
      }
    }

    return instanceList;
  }

  @Override
  @SuppressWarnings("unchecked")
  public List<HistoricProcessInstance> findHistoricProcessInstancesByNativeQuery(Map<String, Object> parameterMap, int firstResult, int maxResults) {
    return getDbSqlSession().selectListWithRawParameter("selectHistoricProcessInstanceByNativeQuery", parameterMap, firstResult, maxResults);
  }

  @Override
  public long findHistoricProcessInstanceCountByNativeQuery(Map<String, Object> parameterMap) {
    return (Long) getDbSqlSession().selectOne("selectHistoricProcessInstanceCountByNativeQuery", parameterMap);
  }

}
